CN101206148A - Method for correct measurement of hyperthermia stress-strain - Google Patents
Method for correct measurement of hyperthermia stress-strain Download PDFInfo
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- CN101206148A CN101206148A CNA2007101689948A CN200710168994A CN101206148A CN 101206148 A CN101206148 A CN 101206148A CN A2007101689948 A CNA2007101689948 A CN A2007101689948A CN 200710168994 A CN200710168994 A CN 200710168994A CN 101206148 A CN101206148 A CN 101206148A
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Abstract
The invention provides a method which can accurately measure high temperature stress-strain, steps of the method are that: (1) the heat output of high temperature strain foils is calibrated; (2) the high temperature strain foils are spot welded on the surface of high temperature components; (3) the strain foils are heated to the rated temperature and the strain value outputted of each strain foil every twenty centidegrees are taken down; (4) the strain datum at different temperatures of each point are modified; (5) stress is calculated. The technical effect of the invention is that the invention is suitable for measuring components at the scene at high temperature conditions, particularly the components and parts of the high temperature and high pressure steam pipeline, the steam turbine engine and the jetting engine in power plants working at high temperature static dynamic loading, which can not only measure the high temperature strain of the materials at the scene, but also can accurately distinguish the mechanical strain from the thermal output value according to the measured strain.
Description
Technical field
The present invention relates to a kind of method that can accurately measure hyperthermia stress-strain.
Background technology
Metal current material at high temperature serviceability is measured, and major part is to be processed into standard sample according to certain standard, its performance of test in breadboard high temperature furnace.But these technology instrument can be used for the laboratory fundamental research, can not be in industry, aviation field is on-the-spot measures, to solve the erection stress that member produces under hot operation.At high temperature carry out strain measurement and use to such an extent that be resistance strain gage, the high temperature resistance foil gauge is to be made by particulate metal wire material, along with temperature rises, the resistance value of foil gauge also can rise or descend, thermal output that Here it is, the thermal output of each high temperature strain foil is all inconsistent, and difference is very big.And when the manufacturer production high temperature strain foil, only indicate resistance value, sensitivity coefficient, do not indicate the thermal output value, so cause measuring error big.
Summary of the invention
The purpose of this invention is to provide a kind of method that can accurately measure hyperthermia stress-strain, it is applicable to and under hot environment the member scene is measured, and can not only on-the-spot measure the high-temp strain of material, and, can accurately mechanical strain and thermal output value be distinguished according to tested strain.
The present invention is achieved like this, its method step is: the demarcation of (1) high temperature strain foil thermal output: before measuring each foil gauge is placed in the numerical control high temperature furnace, cool off with stove after rising to its rated temperature by room temperature, after the same terms circulation is worn out for 2-3 time, static resistance strainmeter when the taking-up high temperature strain foil is burn-on high temperature wire and actual measurement is connected into half-bridge, the temperature compensation that adopts same complementation to repay, progressively rise to rated temperature by room temperature, note the thermal output value and the curve that draws of whenever being separated by 10 ℃ the time, twice of the same terms tie-in, get its mean value during calculating, when handling measurement data, must take into account the thermal output value of relevant foil gauge.This step is that the thermal output value of foil gauge is at high temperature tended towards stability, and after handling through 4-5 high temperature ageing, high temperature strain foil thermal output curve repeatability is fine to be stabilized in the approaching numerical value; (2) high temperature strain foil is spoted weld the high-temperature component surface; (3) be warming up to rated temperature every 20 ℃ of strain values of noting every output; (4) strain data under the each point different temperatures is revised, comprised the correction of high temperature wire resistance, foil gauge thermal output correction and sensitivity coefficient correction; (5) Stress calculation: the revised strain value substitution of each point formula is calculated the stress that member produces.
Technique effect of the present invention: it is applicable under hot environment the member scene is measured, especially at the high temperature and high pressure steam pipeline of generating plant, the parts that steam turbine engines and steam spraying engine are worked under the gentle and quiet dynamic load of height, it can not only on-the-spot measure the high-temp strain of material, and accurately mechanical strain and thermal output value is distinguished according to tested strain energy.
Embodiment
The present invention is achieved like this, and its method step is:
(1) demarcation of high temperature strain foil thermal output, each high temperature strain foil all has different thermal output values, must demarcate through the laboratory before the test, and the strain of testee also is the instrument by special survey strain---the static resistance strainmeter shows, therefore, the thermal output value and the testee strain value of foil gauge must be distinguished, in the hope of accurate mechanical strain value.Concrete operations are as follows: before measuring each foil gauge is placed in the numerical control high temperature furnace, cool off with stove after rising to its rated temperature by room temperature, after the same terms circulation is worn out for 2-3 time, static resistance strainmeter when the taking-up high temperature strain foil is burn-on high temperature wire and actual measurement is connected into half-bridge, the temperature compensation that adopts same complementation to repay, progressively rise to rated temperature by room temperature, note the thermal output value and the curve that draws of whenever being separated by 10 ℃ the time, twice of the same terms tie-in, get its mean value during calculating, when handling measurement data, must take into account the thermal output value of relevant foil gauge.This step is that the thermal output value of foil gauge is at high temperature tended towards stability, after handling through 4-5 high temperature ageing, and fine being stabilized in the approaching numerical value of high temperature strain foil thermal output curve repeatability.
(2) high temperature strain foil is spoted weld the high-temperature component surface.
(3) be warming up to rated temperature every 20 ℃ of strain values of noting every output.
(4) strain data under the each point different temperatures is revised, comprised the correction of high temperature wire resistance, foil gauge thermal output correction and sensitivity coefficient correction.
The correction of high temperature wire resistance
The resistance of resistance strain gage is assumed to be
Because the needs of measuring have connected 1.5 meters long high temperature wires, and the resistance of each foil gauge has been increased
Its correction factor is
Revised strain value is
Be reading strain.
Foil gauge thermal output correction
Thermal output is an important indicator of high temperature strain foil, between each foil gauge thermal output value certain dispersion degree is arranged, and correction formula is
In the formula
With
It is respectively the thermal output value of same temperature active gage and compensating plate.
The sensitivity coefficient correction
Because the sensitivity coefficient of electric wire strain gauge is immutable after setting, when its numerical value is assumed to be 500 ℃, K=2.47, and the sensitivity coefficient of high temperature strain foil generally descends with the temperature rising, need revise for this reason
K in the formula
1Be the accounting temperature sensitivity coefficient, the actual strain value is
(5) Stress calculation calculates the stress that member produces with the revised strain value substitution of each point formula.
Through revised actual strain
Difference substitution physical equation calculated stress, when principal direction of stress is known, i.e. strain
Corresponding major principal stress is
Least principal stress is
Sheet direction and principal direction of stress angle are 0 °
When two principal directions of stress are unknown, promptly
Representative is (radially) laterally,
Representative is axial,
Represent 45 ° oblique, principle stress and direction are respectively that major principal stress is
Least principal stress is
Direction is
is major principal stress in the formula
MaxWith
Between angle, counterclockwise for just, clockwise direction is for bearing.E in the calculating during each temperature
tAnd μ
tTable look-up and to obtain.
Claims (1)
1. the method that can accurately measure hyperthermia stress-strain, its method step is:
(1) demarcation of high temperature strain foil thermal output: before measuring each foil gauge is placed in the numerical control high temperature furnace, cool off with stove after rising to its rated temperature by room temperature, after the same terms circulation is worn out for 2-3 time, static resistance strainmeter when the taking-up high temperature strain foil is burn-on high temperature wire and actual measurement is connected into half-bridge, the temperature compensation that adopts same complementation to repay, progressively rise to rated temperature by room temperature, note the thermal output value and the curve that draws of whenever being separated by 10 ℃ the time, twice of the same terms tie-in, get its mean value during calculating, when handling measurement data, must take into account the thermal output value of relevant foil gauge.This step is that the thermal output value of foil gauge is at high temperature tended towards stability, and after handling through 4-5 high temperature ageing, high temperature strain foil thermal output curve repeatability is fine to be stabilized in the approaching numerical value;
(2) high temperature strain foil is spoted weld the high-temperature component surface;
(3) be warming up to rated temperature every 20 ℃ of strain values of noting every output;
(4) strain data under the each point different temperatures is revised, comprised the correction of high temperature wire resistance, foil gauge thermal output correction and sensitivity coefficient correction;
(5) Stress calculation: the revised strain value substitution of each point formula is calculated the stress that member produces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101689948A CN101206148B (en) | 2007-12-17 | 2007-12-17 | Method for correct measurement of hyperthermia stress-strain |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101689948A CN101206148B (en) | 2007-12-17 | 2007-12-17 | Method for correct measurement of hyperthermia stress-strain |
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| CN101206148A true CN101206148A (en) | 2008-06-25 |
| CN101206148B CN101206148B (en) | 2010-08-18 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477003B (en) * | 2008-11-12 | 2010-12-08 | 中国科学院金属研究所 | Apparatus for loading in high-temperature high-pressure surroundings and its use |
| CN102012416A (en) * | 2010-09-21 | 2011-04-13 | 上海大学 | Method and system for measuring strain characteristic of material under extreme condition |
| CN101614640B (en) * | 2009-07-28 | 2011-08-10 | 中国核动力研究设计院 | High temperature strain foil performance parameter tester and test method thereof |
| CN103148971A (en) * | 2013-02-06 | 2013-06-12 | 合肥通用机械研究院 | Method for testing local stress field of end part structure of thermal jacket of ultrahigh-pressure tubular reactor |
| CN103328945A (en) * | 2010-09-14 | 2013-09-25 | 空中客车运营简化股份公司 | Method of measuring loadings in joins in a high-temperature environment and instrumented shaft for implementation, in particular for rear attachment of aircraft turbojet |
| CN103776814A (en) * | 2014-01-28 | 2014-05-07 | 东南大学 | Measurement method for heat conductivity of thin film material under stress effect of raman scattering |
| CN106813592A (en) * | 2017-03-24 | 2017-06-09 | 同济大学 | A kind of method that utilization fiber grating measures material strain under ultralow temperature |
| CN107490448A (en) * | 2016-08-17 | 2017-12-19 | 宝沃汽车（中国）有限公司 | A kind of revolving part dynamic torque measurement apparatus |
| CN110213328A (en) * | 2019-04-26 | 2019-09-06 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of real-time stress acquisition data network transmission system of thermal power plant's high-temperature pipe |
| CN110398306A (en) * | 2019-07-08 | 2019-11-01 | 华电电力科学研究院有限公司 | A kind of thermal power plant pipe stress Decoupling Analysis system and analysis method |
| CN110715854A (en) * | 2019-09-29 | 2020-01-21 | 山东大学 | Temperature effect-considered nonlinear calibration method for tension-sensitive effect of conductive polymer |
| CN111678799A (en) * | 2020-06-19 | 2020-09-18 | 中国核动力研究设计院 | Displacement loading system applied to strain calibration device |
| CN114111695A (en) * | 2021-11-19 | 2022-03-01 | 北京科技大学 | Correction method for improving high-temperature strain measurement precision |
-
2007
- 2007-12-17 CN CN2007101689948A patent/CN101206148B/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477003B (en) * | 2008-11-12 | 2010-12-08 | 中国科学院金属研究所 | Apparatus for loading in high-temperature high-pressure surroundings and its use |
| CN101614640B (en) * | 2009-07-28 | 2011-08-10 | 中国核动力研究设计院 | High temperature strain foil performance parameter tester and test method thereof |
| CN103328945A (en) * | 2010-09-14 | 2013-09-25 | 空中客车运营简化股份公司 | Method of measuring loadings in joins in a high-temperature environment and instrumented shaft for implementation, in particular for rear attachment of aircraft turbojet |
| CN102012416A (en) * | 2010-09-21 | 2011-04-13 | 上海大学 | Method and system for measuring strain characteristic of material under extreme condition |
| CN102012416B (en) * | 2010-09-21 | 2013-10-16 | 上海大学 | Method for measuring strain characteristic of material under extreme condition |
| CN103148971A (en) * | 2013-02-06 | 2013-06-12 | 合肥通用机械研究院 | Method for testing local stress field of end part structure of thermal jacket of ultrahigh-pressure tubular reactor |
| CN103776814A (en) * | 2014-01-28 | 2014-05-07 | 东南大学 | Measurement method for heat conductivity of thin film material under stress effect of raman scattering |
| CN103776814B (en) * | 2014-01-28 | 2016-01-06 | 东南大学 | A kind of measuring method based on membraneous material thermal conductivity under the effect of stress of Raman scattering |
| CN107490448A (en) * | 2016-08-17 | 2017-12-19 | 宝沃汽车（中国）有限公司 | A kind of revolving part dynamic torque measurement apparatus |
| CN106813592A (en) * | 2017-03-24 | 2017-06-09 | 同济大学 | A kind of method that utilization fiber grating measures material strain under ultralow temperature |
| CN110213328A (en) * | 2019-04-26 | 2019-09-06 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of real-time stress acquisition data network transmission system of thermal power plant's high-temperature pipe |
| CN110398306A (en) * | 2019-07-08 | 2019-11-01 | 华电电力科学研究院有限公司 | A kind of thermal power plant pipe stress Decoupling Analysis system and analysis method |
| CN110398306B (en) * | 2019-07-08 | 2024-05-07 | 华电电力科学研究院有限公司 | Thermal power plant pipeline stress decoupling analysis system and analysis method |
| CN110715854A (en) * | 2019-09-29 | 2020-01-21 | 山东大学 | Temperature effect-considered nonlinear calibration method for tension-sensitive effect of conductive polymer |
| CN111678799A (en) * | 2020-06-19 | 2020-09-18 | 中国核动力研究设计院 | Displacement loading system applied to strain calibration device |
| CN111678799B (en) * | 2020-06-19 | 2022-03-25 | 中国核动力研究设计院 | Displacement loading system applied to strain calibration device |
| CN114111695A (en) * | 2021-11-19 | 2022-03-01 | 北京科技大学 | Correction method for improving high-temperature strain measurement precision |
| CN114111695B (en) * | 2021-11-19 | 2022-12-16 | 北京科技大学 | Correction method for improving high-temperature strain measurement precision |
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| CN101206148B (en) | 2010-08-18 |
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